Preparing substrate

[darkknight]

Hi,

I'm going to start preparing the substrate for my kitchen and my bathroom so that I can tile on it. The current floor is made of floorboards (not chipboard) and is pretty deflection free.

The issue that I have is that there are vinyl tiles stuck to the floor in the kitchen and half of the bathroom. These tiles are stuck down pretty well on some luau wood (spelling) and I am reluctant to take them off as the house ia fairly old and I am worried about the tiles containing asbestos. It is because of this reason I don't want to take them off and would prefer to tile on top of them.

My question is, would it be ok for me to screw some wbp ply down to the existing floor and then place some hardi backer board on top of this? Would tiling on this arrangement be fine?

Ps. The kitchen floor tiles are porcelain and the rest are ceramic.

Many thanks

 

[AliGage]

Tricky one as without removing the vinyl tiles its difficult to know the condition of the substrate and you will be unable to out any further support in to remove any deflection.

Any height issues to worry about?

 

[Time's Ran Out]

What area is involved in the kitchen (sq mts)?

 

[darkknight]

Hey guys, thanks for the replies. Height is a bit of an issue especially as the entrance to the kitchen is from the living room.

The area of the kitchen in total is about 6 square meters.

Cheers

 

[AliGage]

Morning Darknight. I would suggest you call in a professional to take a look at least.
If height is going to be an issue and you're looking to overboard with ply, the recommended ply thickness is 15mm, hardie backer will add 6mm to this. You are then looking close to 1" on your transition from living room to kitchen.

 

[darkknight]

Good morning,

Yes you're right something that I definitely considered.. I was wondering, because the subfloor is pretty sound right now, will 9mm ply under hardie backer board suffice?

How do you guys usually deal with differences in height from one room to another?